Porifera
What are poriferans?
Simple animals with holes all over their bodies.
What are nematodes?
Small, round worms with smooth bodies.
What are the main characteristics that distinguish arthropods from other invertebrates?
Segmented body, exoskeleton, jointed limbs, bilateral symmetry.
What kind of body do mollusks have?
Soft bodies, often with a head, foot, and body mass.
Where do poriferans live?
In oceans and sometimes in fresh water.
Where do nematodes live?
In soil, water, and inside other animals.
How is the body of an arthropod typically segmented, and what are the functions of these segments?
Head (senses), thorax (movement), abdomen (digestion/reproduction).
Where do most mollusks live?
Most live in water, especially in oceans.
Do poriferans have organs or a brain?
No, they don’t have organs, a brain, or nerves.
Do nematodes have a segmented body?I
No, their bodies are not segmented.
How do arthropods grow, and what role does molting (ecdysis) play in their development?
They molt to grow by shedding the old exoskeleton.
What are some common examples of mollusks?
Snails, clams, squids, and octopuses.
How do poriferans eat?
They filter tiny food from water that flows through their bodies.
How do nematodes eat?
They have a mouth and a simple digestive system.
What types of respiratory systems are found in arthropods, and how do they vary between aquatic and terrestrial species?
Aquatic use gills; land species use tracheae or book lungs
How do mollusks move around?
They use a foot to crawl, burrow, or swim.
Can poriferans move?
No, they stay in one place.
Can nematodes be harmful?
Yes, some cause diseases in plants, animals, and people.
What makes arthropods different from other animals without backbones?
They have hard outer shells, jointed legs, and bodies divided into parts.
Do all mollusks have shells?
No, some have shells (like clams), but others don’t (like octopuses)